"Powered crossover" is a bit inaccurate.
Amplifier/crossover combinations are generally referred to most commonly biamplifiers (two way) or triamplifiers (three way).
1224a spec sheet- Altec Lansing 1224A Electronic Crossover Biamplifier Manual | HiFi Engine
They work fine. The built in crossover in this amp is limited compared to modern crossovers.
Basically if you have them, try them. If you like them, use them. But don't pay tons of money for them. Newer amps and newer crossovers or DSP will sound better.
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